Alvin has four coins of Rupees 1, 2, 5 and 10 denominations. The number of different sums of money he can form from them is:

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Solution

The correct option is B 15
Total number of possibilities $=^{4} C_{4} +^{4} C_{3} +^{4} C_{2} +^{4} C_{1} = 1 + 4 + 6 + 4 = 15$
Also, You can make use of the formula, $2^{n} - 1 = 2^{4} - 1 = 15$

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Alvin has four coins of Rupees 1, 2, 5 and 10 denominations. The number of different sums of money he can form from them is:

The correct option is B 15Total number of possibilities =4C4+4C3+4C2+4C1=1+4+6+4=15 Also, You can make use of the formula, 2n−1=24−1=15

The correct option is B 15
Total number of possibilities $=^{4} C_{4} +^{4} C_{3} +^{4} C_{2} +^{4} C_{1} = 1 + 4 + 6 + 4 = 15$
Also, You can make use of the formula, $2^{n} - 1 = 2^{4} - 1 = 15$