fix in content/07a_opcodes/02_math.ipynb

[0x6980]

In the function mulmod(evm)

def mulmod(evm):
    a, b = evm.stack.pop(), evm.stack.pop()
    N = evm.stack.pop()
    evm.stack.push((a + b) * N)
    evm.pc += 1
    evm.gas_dec(8)

this part evm.stack.push((a + b) * N) should be evm.stack.push((a * b) % N)

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