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Sagot :

The explicit formula for a arithmetic sequence is a_n = a_1 + (n - 1)d.

We want to find a_21.

a_21 = 17 + (21 - 1)(10)

a_21 = 17 + (20)(10)

a_21 = 17 + 200

a_21 = 217

The 21st term is 217.