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The price of 3 Accounting Books and 5 Business Mathematics books is 800 and that of 6 Accounting Books and 3 Business Mathematics books is 900. Find the Cost of an Accounting Book and a Business Mathematics book. |
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Answer» Concept Used :- Wᴇ ᴋɴᴏᴡ ᴛʜᴀᴛ, ↝ nᵗʰ TERM of an arithmetic sequence is,Wʜᴇʀᴇ, aₙ is the nᵗʰ term. a is the first term of the sequence. n is the no. of terms. d is the COMMON difference. Tʜᴜs,LET assume that First term of an AP series = ACOMMON difference of an AP series = dGiven that, In an AP series, andOn SUBTRACTING equation (1) from equation (2), we get On substituting the value of d, in equation (1), we getNow, On substituting the values of a and d, we get More to know :- ↝ Sum of n terms of an arithmetic sequence is,Wʜᴇʀᴇ, Sₙ is the sum of n terms of AP. a is the first term of the sequence. n is the no. of terms. d is the common difference. |
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