Question

please solve the question... answer is 7

Answer 1

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Answer 2

S1 = 1^2 - 2×1 = - 1

S2 = 2^2 - 2×2 = 0

S3 = 3^2 - 2×3 = 3

S4 = 4^2 - 2×4 = 8

S1 = A1 = -1

A2 = S2 - S1 = 1

A3 = S3 - S2 = 3

A4 = S4 - S3 = 5

a1 = -1

d = 2

a5 = -1 + (5 -1 ) 2

A5 = -1+8 = 7

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