21st term of the AP, whose first two terms are -2 and 2
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a1 = -2 ; a2 = 2
d = 4
a21 = a + 20 d
= -2 + 20 ( 4 )
= 80 - 2
= 78
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Answer : 78
Step-by-step explanation:
a= -2; d= a2-a = 2-(2) = 4
a21 = a + (21 - 1)d
= -2 + 20×4
= -2 +80
= 78
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