What does it mean by the first term of each is unity in ARITHMETIC PROGRESSIONS?
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What does it mean by the first term of each is unity in ARITHMETIC PROGRESSIONS?
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Answer:
The first term of arithmetic progression is 1 and the sum of the first nine terms equal to 369. The first and the ninth term of a geometric progression conicide with the first and the ninth term of the arithmetic progression
Answer:
a=1,d=5
∴a
n
=a+(n−1)d
=1+(n−1)5
a
n
=5n−4
(A)4880=5n−4
5n=4884
n=(
5
4884
)=notaninteger
(B)7881=5n−4
5n=7885
n=(
5
7885
)=1577=integer
(C)5890=5n−4
5n=5894
n=(
5
5894
)=notaninteger
(D)7891=5n−4
5n=7895
n=(
5
7895
)=1579=integer
∗twooptionspossible.