Table:
0
A
B
C
D
1
Fiscal Year Ended January 31,
2
2019
2018
2017
3
(Unaudited)
4
Diluted net (loss) income per share
$(0.37)
$(2.58)
$(2.61)
5
Stock-based compensation expense
1.12
1.11
1.00
6
Amortization of developed technologies
0.08
0.08
0.18
7
Amortization of purchased intangibles
0.08
0.09
0.14
8
CEO transition costs (2)
—
0.09
—
9
Acquisition related costs
0.07
—
—
10
Restructuring and other exit costs, net
0.14
0.43
0.35
11
(Gain) loss on strategic investments
(0.05)
0.08
—
12
Discrete tax provision items
(0.14)
(0.09)
(0.01)
13
Income tax effect of non-GAAP adjustments
0.08
0.31
0.45
14
Non-GAAP diluted income (loss) per share
$1.01
$(0.48)
$(0.50)

Questions and formulas:
Question: What is the average net restructing and exit costs over the 3 year period?
Formula: (B10+C10+D10)/3
Formula2: (B10+C10+D10)/3
Level: Calculation
Question: What is the difference between the non-GAAP diluted income per share and the diluted net  (loss) income per share in 2019?
Formula: B14-B4
Formula2: B14-B4
Level: Calculation
Question: What was the average stock-based compensation expense over the last 3 years?
Formula: (B5+C5+D5)/3
Formula2: (B5+C5+D5)/3
Level: Calculation