first 16 terms of an arithmetic seq. 20,27,34,42,.....
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first 16 terms of an arithmetic seq. 20,27,34,42,.....
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Answer:First 16 terms of an arithmetic seq. 20,27,34,41,.....
"_" is sub
a_16=125
S_16=1160
Step-by-step explanation:
a_n=a_1+(n-1)d
a_16=20+(16-1)7
=20+(15)7
=20+105
=125
S_n=n/2(a_1+a_n)
S_16=16/2(20+125)
=8(145)
=1160