The sum of the series 1, 5, 9, 13 _______ to 40th series is: - IQ786

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The sum of the series 1, 5, 9, 13 _______ to 40th series is:

The sum of the series 1, 5, 9, 13 _______ to 40th series is:

154

314

3160

158

None of these

Explanation

1,5,9,13, ---- 40th

d=5-1=4 d=9-5=4 =1+(40-1)*4 =1+156 =157

U have to use the formula S=n/2 [2a+(n-1)d]

S=40/2[2(1)+(40-1)4]

S=20[2+(39)4]

S=20[156]

S=3160

ND-8-08-2023