# The first term of an arithmetic sequence is 1 and the sum of the first four terms is 100. Find the first four terms.

a = 1 S4 = 100 n = 4

Sn =

Substituting everything in above equation,

2a + (4-1) × d = 50

3d = 48

d = 16

First four terms are 1,17,33,49.

Hence, the answer is written above.

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