Find the sum of first 25 th term of the sequence 5,8,11
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Answer:
1025
Step-by-step explanation:
a=5,d=8-5 =3,n = 25,Sn = ?
Sn = n/2[2a+(n-1)d]
S25 = 25/2[2×5 + (25-1)(3) ]
S25 = 25/2[10+(24×3)]
S25 = 25/2[10+72]
S25 = 25/2[82]
S25 = 1025
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